I ran the update from Garmin Express on my Zumo 660 for new maps and software, but I guess a file got corrupted somehow and now it freezes with "loader loading" on the screen. Computer doesn't see the unit.
Has anyone had/solved this issue?
There is a procedure on line for a Nuvi but it doesn't work for Zumo (tried every possible variation - no luck). Tried removing the battery for 10 minutes, holding the on/off switch down etc.
Apparently you have to get the unit into "mass storage" mode so you can delete the corrupted file from your computer, then re-install the update.

Talked to Garmin, and Raytech, their Canadian warranty shop, and they are replacing the unit, DESPITE IT BEING OVER 4 YEARS OLD, and expediting it to me in under a week so I'll have it for my upcoming Mexico trip.
Hats off to Garmin and Raytech for great service above and beyond.

I've had similar service from Garmin here in the UK. Zumo 550 failed to turn on, sent it in and they declared it permanently dead and would replace it. However they had no 550's and we were due to go to Morocco in about 10 days time. Their solution? Send me a Zumo 660 as a replacement unit at no cost to me even though the 550 was about 3 years old.

Yes their units are expensive but if they provide customer service like that at least I can see where some of my money went.

Garmin had me go through 20 mins of trying to reset the garmin. They gave up and gave me an RMA. I sent it back and the day after they got it, I have a refurbished one coming back to me. Not bad for a 4 year old product. He mentioned because it was a software screwup and nothing physical I did to the unit, they would replace it.

Did you use a mac to update your garmin? I did. I wonder why so many are locking up with the latest update.

I have this problem today in Australia. I called Garmin. Their answering service is in the Phillipines. They emailed me a piece of software to upgrade my unit. It would still not recognise the USB connection. I tried with two ports and two cables. So far no joy at all. A call tomorrow will follow.

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"There are NO coincidences." (102 year old lady in a church in Scotland)